I think in this case it's important to be ethical more for your sake than for the sake of the fish. I don't think fish care one way or the other if they live or die... "care" isn't something in their cognitive realm. Again, this isn't something that goes over well on a fish forum, but I see fish basically as organic machines. I do a lot of research into artificial intelligence, and the differences between electronic life and biological life are often far slimmer than you might think. Scientists who create evolutionary algorithms to simulate something adapting to an environment (i.e. making a computer find a solution to a problem through millions of 'generations' of trial and error) are frequently surprised by the complexity and originality of the results. At this point the typical computer has the 'brain power' of an insect, with fish closing in fast on the chart. The idea of creating a robotic fish that appears to respond to physical harm with fear and pain reactions that we could empathize with (and even feel queasy witnessing) isn't far-fetched at all. But of course, knowing it was a robot, you would look at it and say, "It's too basic a machine. It doesn't
feel anything. It's just programmed to respond that way because that's what keeps it in one piece. It isn't
thinking anything of it." But then, if you had a biological organism of equal complexity obeying similar 'survival programs'... where exactly do the differences lie?
Yes, I know how insanely sidetracked I just got.
But anyway, my point is, I believe what matters here isn't what the fish 'feels'. What matters is how we treat it simply because it's a part of the same chain of life we are. The fish is simply a mirror. Whether you treat it with kindness or cruelty is a reflection on who and what you are as a thinking being. Yes I would discourage mistreating a fish for the sake of the fish to an extent, but for the most part I would discourage it because it's simply a bad habit to get into and it can create tiny echoes into the rest of your life. Allowing your compassion to lapse like that will, in some minuscule way, negatively affect who you are tomorrow. And it builds.
So what I mean is, if "I'm going to hurt it because it can't feel it anyway" is a thought that ever crosses your mind, then I think there's something wrong.
If we were talking about dogs, who definitely feel pain on a conscious, traumatizing level, it would be a whole different ballgame. But fish just don't seem to have the equipment for it.
There's a metaphor I keep in mind that seems to apply here. I see the planet as a sort of 'organism'. A person is made up of lifeforms that have thoroughly adapted themselves to act together as a system. An ecosystem is made up of the same. When a cell in your body decides to go rogue and puts its own existence (and proliferation) above the existence of the system... we call it cancer. Which eventually results in the death of both the system and the rogue cells. We're alive because our parts know that ultimately what's good for their neighbors is good for them. And our ecosystem is alive (albeit in a state of decline) because there are still enough plants and animals and people that know what's good for another organism is good for them.
What's good for the fish is good for you.
And also, we're earth-cancer.
I'm rambling today. My sincere apologies to all who've bothered to read this far.
(And yes, I realize you can easily follow robot fish analogies with robot people analogies. That's part of what's going to make the 21st century so interesting.)